Simeon broadmeadow



s. BROADMEADOW.

Blast Furnace. N0. 175 Patented Apr. 5, 183.7.

AM. P HBTO-LITHD. C0. NY. (OSBORNE'S PRO [2585.)

ATENT QFFICE.

SIMEON BROADMEADOW, OF NEWV YORK, N. Y.

IMPROVEMENT IN CONSTRUCTION OF FURNACES FOR THE SMELTlNG OF IRON OREBYTHEUSE OF HARD OR ANTHRAClTE COAL.

Specification forming part ofLetters Patent No. R75. dated April 5,1837.

f0 ctZZ 1071 0111, it may concern:

Be it known that I, SIMEoN BRoADMEAnow, of the city of New York, in theState of New York. have invented a new and Improved Mode of ConstructingFurnaces for the Smelting of Iron Ore by the Use of Hard or AnthraciteOoal as a Fuel 5 and I do hereby declare that the following is a fulland exact description thereof.

The dimensions of the respective parts of my furnace, which I am aboutto give, are such as will designate one of ordinary size, my objecttherein being to afford a clear view of its general construction andarrangement, without intending to limit myself to the preciseadmeasurements set down, but rather to exhibit a generalcharacter bywhich any competent iron-master will be'enabled to see the differencebetween my furnace and all those which have preceded it, and also toconstruct the same. The whole height of the furnace above the hearth istwenty-five feet. The form of the stack above the tymp is' that of twotruncated cones, the bases of which unite at the middle of the stack,whence they regularly taper to the diameter of two feet at the top andthe same at the tymp. The tymp must be eighteen inches long and nineinches deep, as will be seen by the drawing deposited in the PatentOffice, which is drawn upon a scale of half an inch to a foot. Thehearth below the tymp, where the molten iron lies ready to be drawn off,is three feet square and two feet deep, whence the slag or dead cindersare to be thrown off as in other furnaces. I use two tuyeres, which atthe inlet are each two inches in diameter. The pressure of the blast istwo pounds and a half to the square inch. Should the furnace much exceedthe height designated, the weight of the anthracite and of the ore willbe such as to obstruct the passage of the blast through the mass, andconsequently to defeat the process; but by keeping the proportions giventhe pressure of the mass upon the tuyere will be moderated,

and the blast will readily find its way to the top of the furnace, and agood working heat be attained. In using such a furnace I first heat itby putting in three hundred bushels of charcoal. I then charge it byputting in two hundred pounds of hard coal, then two hundred pounds ofiron ore, and fifty pounds of limestone, repeating the charge as thematerials sink, treating it in these particulars in the ordinary mode ofmanaging furnaces for making iron. The ore is to be roasted andotherwise prepared in the ordinary way, and I of course vary the fluxand other things according to the nature of the ore to be smelted.

That I claim as my invention, and wish to secure by Letters Patent, is-

The construction and employment-of such a furnace as that hereindescribed for smelting iron by means of anthracite or hard coal-that isto say, a furnace which is substantially the same with that described inthe general structure, proportion, and arrangement of the partcontaining the ore to be smelted.

SIMEON BROADMEADOW.

, Witnesses:

I. LABAGH, Jr. G. W. GUIDER.

